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. 2019 Oct 18;14(10):e0222567. doi: 10.1371/journal.pone.0222567

Fig 3. Response surface of the multiple regression equation.

Fig 3

(A) Effect of the total P (X1) and quick K (X2) contents on the soluble solids content (Y1). (B) Effect of the total P (X1) and quick K (X2) contents on the total triterpenoids content (Y2).